1. Mandarin Chinese: 939 million
2. Hindi: 602 million
3. English: 379 million
4. Spanish: 534 million
5. Arabic: 274 million
6. Bengali: 265 million
7. Portuguese: 257 million
8. Russian: 154 million
Note: These figures are based on native speakers only. If you include second language speakers and people who use the language for other purposes (e.g., business), the numbers for some languages would be significantly higher.